#include "add.h"
#include "sub.h"

int main()
{
    int x = 30;
    int y = 20;

    int ret1 = my_add(x, y);
    int ret2 = my_sub(x, y);

    printf("ret1 = %d\n",ret1);
    printf("ret2 = %d\n",ret2);
    return 0;
}

